Delhi (Metro Rail News): Larsen and Toubro’s Tunnel Boring Machine DZ1123 (TBM-2) achieved a breakthrough on 5 October at Chhatarpur Mandir Station of Golden Line (Tughlakabad-Aerocity), which is being developed as part of Delhi Metro’s Phase 4.
For this assignment, TBM DZ1123 constructed about 860-metre-long underground tunnel between Chhatarpur and Chhatarpur Mandir Station. This development marks the completion of the underground tunnel between Chhatarpur and Chhatarpur Mandir Station on the Tughlakabad-Aerocity corridor.
This was TBM-2 (DZ1123)’s second breakthrough, which is also the fourth overall breakthrough for Delhi Metro’s Phase 4 project in the 6.51 km Package DC-09. This package connects the Kishangarh and Saket G Block stations.
As per the DMRC’s release, this tunnel has been constructed at an average depth of approximately 12 meters, with about 613 rings installed, each having an inner diameter of 5.8 meters.
The tunnelling work involved several challenges, including relocating a 66 KV electrical HT line. Additionally, the Tunnel Boring Machine (TBM) had to pass beneath the existing Yellow Line viaduct without causing any disruption to Metro train operations on the Yellow Line.
Package DC-09 of Delhi Metro Phase 4
In March 2022, L&T secured Package DC-09 at Rs. 1428 crore from DMRC with a 42-month deadline.
This package includes 4 stations:
- Chhattarpur Interchange with Yellow Line)
- Chhattarpur Mandir
- IGNOU
- Neb Sarai
On 21 August 2024, TBM-1 achieved a breakthrough at Chhattarpur Mandir Station and built an 865-meter parallel tunnel between Chhattarpur Station and Chhattarpur Mandir Station.
